Video Wall Calibration
One of the hallmark features of Userful is the ability to calibrate multiple displays of any size, shape, or rotation into a single unified Video Wall, and deliver live content to that wall with flawless synchronization and no need to author custom content. Userful’s Video Wall Calibration interface makes the process of creating this canvas straightforward.


Before we begin, it’s important to understand some basic terms that we will use in the rest of this document.
We use the term Video Wall to describe the physical collection and arrangement of your displays in their mounted and aligned configuration.
A Grid Video Wall is any wall that exclusively uses displays of identical type and arrangement to create a rectangular geometrical shape.
A Grid Video Wall
A Zone is a set of one or more displays within a calibrated wall.
A Video Wall divided into Zones
A Display is an individual visual element of the wall, either a panel or segment of a Direct-View LED setup, driven by either a Zero Client or uClient.
A Display powered by Userful
An Artistic Video Wall is any wall that uses displays of different sizes, shapes, or arrangements to create visually distinctive arrangements.

Grid Video Wall

It is strongly recommended that hanging and adjustment of the physical video wall be accomplished before calibrating with Userful.
Calibrating your video wall should be done in-person - with the person doing the calibrating physically in front of the wall. This person should also be using a laptop with a Desktop web browser, rather than a phone or tablet, as the calibration interface is not suited for mobile experiences.
Click New Video Wall to open this interface. By default, you are set up to calibrate a 2x2 video wall.
Opening the Video Wall Calibration Interface
To change the layout of the wall, click + or - by Rows/Columns in the bottom left corner. If you have a Professional+ or Enterprise license, you will be able to create a setup of almost any size or style (5x5, 7x2, etc)
Adding or removing displays
Once you have created a setup that matches your physical wall in terms of layout, click each white box in the center of each “display”, then select the ID of the display which will be in that position on the video wall. During calibration, the physical display will have a corresponding number shown on it to make identification easy.
Once you have assigned a Display to every position on your wall, adjust the padding until all of the lines are visually aligned across all displays. Padding does not denote any particular measurement of distance or pixels, it is only meant to serve as a reference. Clicking the +/- icons will adjust by one unit of distance. Holding the Ctrl button on your keyboard and clicking will adjust by tenths of a unit for perfect alignment.
You can use the Color Calibration interface to adjust the color of each display, however this may not be as effective as using color correction functions in individual panels themselves. Color correcting your video wall before setting up Userful is recommended, as if the Userful server experiences issues or the calibration is deleted, significant work could be lost.
Mapping Displays and calibrating bezels to create a Video Wall
Once you've finalized your grid layout video wall, click OK. You can now map the new video wall to a source.

Artistic Video Wall

To configure an Artistic Layout, click New Video Wall, then Switch to Artistic in the bottom-left corner. Note that the grid controls disappear. You will want to click Add Display if you are dealing with more than 4 displays.
Working with Displays in Artistic Mode
Clicking on each display will show a set of controls.
The Arrows will rotate the display in 90-degree increments.
Rotating in 90-degree increments
The Yellow Dot can be click-and-dragged to rotate the display by hand (a mouse is recommended for this).
Rotating by hand
The gear icon brings up some manual display options.
Rotating with manual entry
The trash icon will delete the display.
Deleting a display

Manual Options

Manually edit the properties of a display
The gear icon opens a Display Settings where you can manually adjust.
  • Display Size - this should be read automatically but sometimes needs to be corrected to accurately represent the size of the display
  • Rotation - allows you to manually enter the exact angle of rotation in degrees
  • Position - allows fine-tuning of display position in relation to other displays. It’s better to use the calibration shortcuts below for this, however
A calibrated Artistic Video Wall

Adjusting a Video Wall

It's not necessary to repeat the entire process of calibration if you are not happy with the initial result.
Click any Zone and select the Calibrate Video Wall button.
Adjusting an existing Video Wall

Calibration Keyboard Shortcuts

Select one display in the video wall with your mouse and use the below key combinations to adjust calibration. Note that these shortcuts are intended to be used while looking at the wall itself, not the Control Center interface in your browser.
Key Combo
Arrow Keys (Up, Down, Left, Right)
One unit of movement in any direction
Shift + Arrow Keys
10 times (10x) movement in any direction
Ctrl + Arrow Keys
0.1 (0.1x) unit of movement in any direction
Bracket Keys [ ]
1 degree of rotation clockwise or counterclockwise
Shift + Bracket Keys [ ]
10 degrees of rotation clockwise or counterclockwise
Ctrl + Bracket Keys [ ]
0.1 degrees of rotation clockwise or counterclockwise
Select the next display
Shift + Tab
Select the previous display
Select multiple displays

Artistic Video Wall Calibration Tips

Calibrating an artistic wall can be challenging, especially when doing it for the first time. Here are some tips:
  1. 1.
    Bring a leveling device - straight edge, leveling laser, or even a piece of string, so you can be sure that the lines on the displays are really lining up, and your eyes are not betraying you after a long day!
  2. 2.
    Use a laptop (Windows, Mac, Chromebook, Linux) with a mouse to do calibration, not a mobile device with a touchscreen.
  3. 3.
    Verify all display sizes are accurate. Sometimes a client or uClient will not read the correct size for the display from the EDID. Ensure the display size (in inches) matches the display on the wall.
  4. 4.
    If you are creating a wall with ~12 displays or fewer, start with one central display, and add additional displays, one at a time. Make sure you are completely satisfied with the level of calibration before moving on to the next display.
  5. 5.
    If you are creating a larger wall, start with the outermost, corner displays, pick a segment, and work your way inwards. You can select multiple displays (Ctrl+Click) and adjust them as a group if things start to look mis-aligned.
  6. 6.
    The majority of your time spent calibrating displays should be spent with your eyes on the video wall displays themselves. Do not try to achieve perfect calibration by looking at the UCC calibration interface.
  7. 7.
    Practice with and use the keyboard shortcuts!
Last modified 1yr ago